/* AI 提效 ROI 计算器站 - 全局样式 */
:root {
  --primary: #059669;
  --primary-dark: #047857;
  --primary-light: #d1fae5;
  --primary-bg: #ecfdf5;
  --text: #1f2937;
  --text-light: #6b7280;
  --bg: #ffffff;
  --bg-gray: #f9fafb;
  --border: #e5e7eb;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
  --max-width: 1320px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}
.site-nav { display: flex; gap: 24px; align-items: center; }
.site-nav a { color: var(--text); font-size: 15px; }
.site-nav a:hover { color: var(--primary); }

/* Hero */
.hero {
  padding: 80px 0;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-bg) 0%, #f0fdf4 100%);
}
.hero h1 {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text);
}
.hero p {
  font-size: 18px;
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto 32px;
}

/* Section */
.section { padding: 64px 0; }
.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
}
.section-desc {
  color: var(--text-light);
  margin-bottom: 32px;
  font-size: 16px;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.card-category {
  display: inline-block;
  font-size: 12px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
}
.card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}
.card p {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 16px;
}
.card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

/* Calculator Page */
.calc-page { padding: 48px 0; }
.calc-page h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
}
.calc-desc {
  color: var(--text-light);
  font-size: 16px;
  margin-bottom: 32px;
}

/* Calculator Form */
.calc-form {
  background: var(--bg-gray);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 32px;
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}
.input-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}
.input-wrapper input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
  max-width: 240px;
}
.input-wrapper input:focus {
  border-color: var(--primary);
}
.input-unit {
  font-size: 14px;
  color: var(--text-light);
  white-space: nowrap;
}
.calc-btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 12px 32px;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 8px;
}
.calc-btn:hover { background: var(--primary-dark); }

/* Results */
.calc-results {
  display: none;
  margin-bottom: 32px;
}
.calc-results.active { display: block; }
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}
.result-card {
  background: var(--primary-bg);
  border: 1px solid var(--primary-light);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.result-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}
.result-label {
  font-size: 14px;
  color: var(--text-light);
}
.result-unit {
  font-size: 14px;
  color: var(--primary-dark);
}
.results-note {
  font-size: 13px;
  color: var(--text-light);
  padding: 12px 16px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  margin-top: 16px;
}

/* Formula */
.calc-formula {
  background: var(--bg-gray);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 32px;
}
.calc-formula h3 {
  font-size: 16px;
  margin-bottom: 8px;
}
.calc-formula p {
  font-size: 14px;
  color: var(--text-light);
  font-family: "SF Mono", "Fira Code", monospace;
}

/* Related */
.related-calcs { margin-bottom: 32px; }
.related-calcs h3 {
  font-size: 18px;
  margin-bottom: 16px;
}
.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.related-list a {
  display: inline-block;
  padding: 8px 16px;
  background: var(--bg-gray);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
}
.related-list a:hover {
  background: var(--primary-light);
  border-color: var(--primary);
}

/* FAQ */
.faq-section { margin-bottom: 32px; }
.faq-section h3 {
  font-size: 18px;
  margin-bottom: 16px;
}
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-q {
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 15px;
}
.faq-a {
  color: var(--text-light);
  font-size: 14px;
  line-height: 1.8;
}

/* Guide Page */
.guide-page { padding: 48px 0; }
.guide-page h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
}
.guide-meta {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 32px;
}
.guide-content h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 32px 0 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.guide-content h2:first-child {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}
.guide-content p {
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.8;
}

/* Trust Pages */
.trust-page { padding: 48px 0; }
.trust-page h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 24px;
}
.trust-page h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 24px 0 12px;
}
.trust-page p, .trust-page li {
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 12px;
}
.trust-page ul {
  padding-left: 24px;
  margin-bottom: 16px;
}

/* Footer */
.site-footer {
  background: var(--bg-gray);
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  margin-top: 64px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
.footer-brand p {
  color: var(--text-light);
  font-size: 14px;
  margin-top: 8px;
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
}
.footer-col a {
  display: block;
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 8px;
}
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
}

/* Language Switch */
.lang-switch { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.lang-switch a { font-size: 14px; color: var(--text-light); text-decoration: none; padding: 4px 8px; border-radius: 4px; }
.lang-switch a:hover { color: var(--primary); }
.lang-switch a.active { color: var(--primary); font-weight: 600; }

/* Responsive */
@media (max-width: 768px) {
  .hero { padding: 48px 0; }
  .hero h1 { font-size: 28px; }
  .hero p { font-size: 16px; }
  .card-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .site-nav { gap: 16px; }
  .site-nav a { font-size: 14px; }
  .results-grid { grid-template-columns: 1fr 1fr; }
  .result-value { font-size: 24px; }
  .calc-form { padding: 20px; }
  .input-wrapper input { max-width: 100%; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: 1fr; }
  .site-header .container { flex-wrap: wrap; gap: 12px; }
  .site-nav { width: 100%; justify-content: center; }
}

/* ==================== 新增组件样式 ==================== */

/* 结果可视化条 */
.result-bar {
  margin-top: 12px;
  background: rgba(5, 150, 105, 0.1);
  border-radius: 4px;
  height: 6px;
  overflow: hidden;
}
.result-bar-inner {
  height: 100%;
  background: var(--primary);
  border-radius: 4px;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.result-bar-inner.negative { background: #dc2626; }

/* 结果操作按钮 */
.results-actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.btn-action {
  padding: 8px 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  cursor: pointer;
  color: var(--text);
  transition: all 0.2s;
}
.btn-action:hover { border-color: var(--primary); color: var(--primary); }
.btn-copy:hover { background: var(--primary-light); }

/* Toast 提示 */
.calc-toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
}
.calc-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* FAQ 折叠 */
.faq-q {
  position: relative;
  padding-right: 32px;
  user-select: none;
}
.faq-q::after {
  content: '+';
  position: absolute;
  right: 8px;
  top: 0;
  font-size: 20px;
  color: var(--primary);
  transition: transform 0.2s;
}
.faq-item.open .faq-q::after { content: '−'; }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  margin-top: 0;
}
.faq-item.open .faq-a {
  max-height: 500px;
  margin-top: 8px;
}
.faq-section .faq-item:not(.open) .faq-a {
  max-height: 0;
}
.faq-section .faq-item .faq-a {
  display: block;
}

/* 工具评测页 */
.tool-page { padding: 48px 0; }
.tool-header {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 32px;
  padding: 32px;
  background: var(--bg-gray);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.tool-emoji {
  font-size: 64px;
  line-height: 1;
}
.tool-header-info { flex: 1; }
.tool-header-info h1 {
  font-size: 32px;
  margin-bottom: 8px;
}
.tool-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 12px 0;
  font-size: 14px;
  color: var(--text-light);
}
.tool-rating {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 16px;
  color: #f59e0b;
  font-weight: 600;
}
.tool-price {
  display: inline-block;
  padding: 4px 10px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 4px;
  font-weight: 600;
  font-size: 14px;
}
.tool-summary {
  font-size: 16px;
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 0;
}

.tool-section {
  margin-bottom: 40px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.tool-section h2 {
  font-size: 20px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.tool-pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.tool-pros, .tool-cons {
  list-style: none;
  padding: 0;
}
.tool-pros li, .tool-cons li {
  padding: 8px 0 8px 28px;
  position: relative;
  border-bottom: 1px dashed var(--border);
  font-size: 14px;
  line-height: 1.6;
}
.tool-pros li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 8px;
  color: var(--primary);
  font-weight: 700;
}
.tool-cons li::before {
  content: '✗';
  position: absolute;
  left: 0;
  top: 8px;
  color: #dc2626;
  font-weight: 700;
}

.tool-scores-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 32px;
}
.tool-score-row {
  display: grid;
  grid-template-columns: 100px 1fr 40px;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}
.tool-score-bar {
  background: var(--bg-gray);
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
}
.tool-score-inner {
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  height: 100%;
  border-radius: 4px;
  transition: width 0.6s ease;
}
.tool-score-num {
  font-weight: 600;
  color: var(--primary);
  text-align: right;
}

.tool-verdict {
  background: var(--primary-bg);
  border-left: 4px solid var(--primary);
  padding: 20px 24px;
  border-radius: 4px;
  margin: 32px 0;
}
.tool-verdict h2 {
  font-size: 18px;
  color: var(--primary-dark);
  margin-bottom: 8px;
}
.tool-verdict p {
  font-size: 15px;
  margin: 0;
}

.tool-best-for {
  background: #ecfeff;
  border: 1px solid #67e8f9;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 16px 0;
}
.tool-best-for h3 {
  font-size: 14px;
  color: #0e7490;
  margin-bottom: 8px;
}
.tool-best-for ul { list-style: disc; padding-left: 20px; margin: 0; }
.tool-best-for li { font-size: 14px; line-height: 1.7; }

.tool-not-for {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 16px 0;
}
.tool-not-for h3 {
  font-size: 14px;
  color: #991b1b;
  margin-bottom: 8px;
}
.tool-not-for ul { list-style: disc; padding-left: 20px; margin: 0; }
.tool-not-for li { font-size: 14px; line-height: 1.7; }

/* 工具卡片 */
.tool-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: all 0.2s;
  display: block;
  color: inherit;
}
.tool-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--primary);
}
.tool-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.tool-card-emoji { font-size: 36px; line-height: 1; }
.tool-card-name {
  font-size: 16px;
  font-weight: 700;
  margin: 0;
}
.tool-card-vendor {
  font-size: 12px;
  color: var(--text-light);
}
.tool-card-rating {
  margin-left: auto;
  color: #f59e0b;
  font-weight: 600;
  font-size: 14px;
}
.tool-card-summary {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
  margin: 8px 0 12px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.tool-card-price {
  font-size: 13px;
  color: var(--primary-dark);
  font-weight: 600;
}

/* 案例研究页 */
.case-page { padding: 48px 0; }
.case-header {
  background: linear-gradient(135deg, var(--primary-bg) 0%, #f0fdf4 100%);
  padding: 32px;
  border-radius: var(--radius);
  margin-bottom: 32px;
}
.case-header h1 { font-size: 28px; margin-bottom: 12px; }
.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 16px 0;
}
.case-meta-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(5, 150, 105, 0.1);
  color: var(--primary-dark);
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
}
.case-summary {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  margin: 0;
}

.case-section {
  margin-bottom: 32px;
}
.case-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary-light);
}
.case-section p {
  line-height: 1.8;
  color: var(--text);
}

.solution-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}
.solution-table th, .solution-table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.solution-table th {
  background: var(--bg-gray);
  font-weight: 600;
}
.solution-table tr:hover { background: var(--bg-gray); }

.results-highlight {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin: 16px 0;
}
.result-highlight-card {
  background: #fff;
  border: 2px solid var(--primary-light);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.result-highlight-value {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}
.result-highlight-label {
  font-size: 13px;
  color: var(--text-light);
}

.lessons-list {
  list-style: none;
  padding: 0;
  counter-reset: lesson;
}
.lessons-list li {
  position: relative;
  padding: 12px 12px 12px 48px;
  margin-bottom: 12px;
  background: var(--bg-gray);
  border-radius: var(--radius);
  counter-increment: lesson;
  line-height: 1.7;
}
.lessons-list li::before {
  content: counter(lesson);
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.ceo-quote {
  border-left: 4px solid var(--primary);
  padding: 16px 24px;
  background: var(--primary-bg);
  border-radius: 4px;
  margin: 24px 0;
  font-style: italic;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}
.ceo-quote::before {
  content: '"';
  font-size: 36px;
  color: var(--primary);
  line-height: 0.5;
  vertical-align: -8px;
  margin-right: 4px;
}

/* 基准数据页 */
.benchmark-page { padding: 48px 0; }
.benchmark-section {
  margin-bottom: 40px;
}
.benchmark-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
}
.benchmark-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.benchmark-table thead {
  background: var(--primary);
  color: #fff;
}
.benchmark-table th {
  padding: 14px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
}
.benchmark-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.benchmark-table tbody tr:hover { background: var(--bg-gray); }
.benchmark-table tbody tr:last-child td { border-bottom: none; }
.benchmark-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 4px;
  font-size: 12px;
  margin: 2px 4px 2px 0;
}

/* 章节标记 */
.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

/* 数据更新时间 */
.data-meta {
  color: var(--text-light);
  font-size: 13px;
  margin-bottom: 16px;
}

/* 改进的导航 */
.site-nav .nav-dropdown {
  position: relative;
}
.site-nav .nav-dropdown:hover .nav-dropdown-menu {
  display: block;
}
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  min-width: 180px;
  padding: 8px 0;
  z-index: 100;
}
.nav-dropdown-menu a {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--text);
}
.nav-dropdown-menu a:hover {
  background: var(--primary-bg);
  color: var(--primary);
}

/* Hero 改进 */
.hero-features {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 24px;
  flex-wrap: wrap;
}
.hero-feature {
  font-size: 14px;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 6px;
}
.hero-feature::before {
  content: '✓';
  color: var(--primary);
  font-weight: 700;
}

/* 分类筛选 */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.filter-btn {
  padding: 6px 14px;
  background: var(--bg-gray);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.filter-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* 表格响应式 */
@media (max-width: 768px) {
  .tool-pros-cons { grid-template-columns: 1fr; }
  .tool-scores-grid { grid-template-columns: 1fr; }
  .tool-header { flex-direction: column; padding: 20px; }
  .tool-emoji { font-size: 48px; }
  .benchmark-table { font-size: 12px; }
  .benchmark-table th, .benchmark-table td { padding: 8px; }
  .case-header { padding: 20px; }
  .results-highlight { grid-template-columns: 1fr 1fr; }
}